I don't wanna say NP are bad products, I have not much simpaty in the brand, but it's only personal experience and feeling.
Regarding boom it depends from the quality, and I'm sure that the X6 that is the NP middle line has to be (VERY) good. Pheraphs you have had to pay little more for the brand name and so sponsorships-marketing- etc, but if this isn't a problem for you, no matter.
Have good wind and share your experiences with your new boom.